1. 12/2/ :23 PM
APP-410T
Real time communication: keep your Metro style app connected whether it is running or suspended
Raghu Gatta
Principal Development Lead
Microsoft Corporation
Kamal Srinivasan
Program Manager
Microsoft Corporation
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

2. Agenda Real Time Communication (RTC) app requirements
User in control of the RTC apps
Building your RTC app in Windows 8
You’ll leave knowing how to
Build communication apps that work 24x7

3. Customer promise in Windows 8
Longer battery life
Always reachable apps

4. Review app process lifetime
Running
App
Suspended
App
Terminated
App
Suspending
Low Memory
Resuming

5. RTC apps that need to be always reachable
What about RTC apps?
VoIP IM
Mail
RTC apps that need to be always reachable

6. Windows enables you to develop apps that are always reachable!

7. The app lifecycle …with RTC apps Background Task Executes Background
Running
App
Suspended
App
Terminated
App
Suspending
Low Memory
Resuming

9. Running an app in the background
12/2/ :23 PM
demo
Chat app (PingMe)
Running an app in the background
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

10. RTC trigger APIs for your appsOS
VoIP IM
Mail
Network Trigger
System Trigger
Time Trigger
Background Task Infrastructure

11. Building an always reachable IM app

12. Building an IM app on Windows 8
Network Trigger
System Trigger
Time Trigger
Background Task Infrastructure
VoIP IM
Mail
Network Trigger
System Trigger
Receive an IM when app is in the background
Receive an IM after user logs in

13. Execution Pattern App registers for trigger OS waits Trigger fires
Background task executes

14. Register for IM network trigger
Open your socket
using Windows.Networking.Sockets;
StreamSocket sock = new StreamSocket();
// Connect the streamsocket …
// Create a Notification Channel with Push capability
NotificationChannel nc = new NotificationChannel(
"channelOne",
“MyApp.Background.KeepAliveTask",
“MyApp.Background.PushNotifyTask",
ServerKATimeInMins);
Add Control Channel metadata
// Associate the socket with the notification channel
channelStatus = nc.UsingTransport(sock);
Register your socket
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

15. App execution upon receiving IM
Network Trigger
App execution upon receiving IM
using Windows.ApplicationModel.Background;
public sealed class PushNotifyTask : IBackgroundTask {
public void Run(IBackgroundTaskInstance taskInstance) {
// Handle Incoming message
// Throwing a toast code }
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

16. Keep Alive maintains your control channel
Network Keep alive Interval
Server Keep alive Interval

17. App execution on Keep Alive
Network Trigger
App execution on Keep Alive
using Windows.ApplicationModel.Background;
public sealed class KeepAliveTask : IBackgroundTask {
public void Run(IBackgroundTaskInstance taskInstance) {
// Send Keepalive message to remote server } }}
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

18. Register on User Login using Windows.ApplicationModel.Background;
System Trigger
Register on User Login
Create user login trigger
using Windows.ApplicationModel.Background;
// Specify the trigger
IBackgroundTrigger trigger =
new SystemTrigger(SystemTriggerType.SessionStart, false);
Associate trigger with app code
// Associate app code with the trigger
BackgroundTaskBuilder taskBuilder = new BackgroundTaskBuilder();
taskBuilder.TaskEntryPoint = “MyApp.Background.RegisterForUserLogin";
taskBuilder.SetTrigger(trigger);
taskBuilder.Name = “OnUserPresent";
Register trigger
// Register the task for background execution
IBackgroundTaskRegistration taskRegistration = taskBuilder.Register();
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

19. App execution on User Login
System Trigger
App execution on User Login
using Windows.ApplicationModel.Background;
public sealed class RegisterForUserLogin: IBackgroundTask {
public void Run(IBackgroundTaskInstance taskInstance) {
// Your app code to create notification channel }
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

20. Receive an IM when in “Connected Standby”
12/2/ :23 PM
demo
Chat app (PingMe)
Receive an IM when in “Connected Standby”
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

21. Always connected Mobile broadband (e.g. 3G, 4G, LTE, etc.)
Network Connectivity

22. How does this work in connected standby?

23. Nothing special, one model to stay connected.

24. Building a POP mail client with periodic updates

25. Building a POP mail app on Windows 8
Network Trigger
System Trigger
Time Trigger
Background Task Infrastructure
VoIP IM
Mail
Time Trigger
Periodic Mail Sync

26. Register for Periodic Mail Sync
Time Trigger
Register for Periodic Mail Sync
Create time trigger
using Windows.ApplicationModel.Background;
// Specify the trigger
TimeTrigger trigger = new TimeTrigger(UpdateInterval, Periodic);
Associate trigger with app code
// Associate app code with the trigger
BackgroundTaskBuilder taskBuilder = new BackgroundTaskBuilder();
taskBuilder.TaskEntryPoint = “MyApp.Background.Update Task";
taskBuilder.SetTrigger(trigger);
taskBuilder.Name = “TimerExpiry";
Register trigger
// Register the task for background execution
IBackgroundTaskRegistration taskRegistration = taskBuilder.Register();
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

27. App execution upon timer expiry
Time Trigger
App execution upon timer expiry
using Windows.ApplicationModel.Background;
public sealed class Update Task : IBackgroundTask {
public void Run(IBackgroundTaskInstance taskInstance) {
// Your app code to update }
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

28. Review

29. Key points
Longer Battery Life
Always Reachable Apps

30. Write your RTC app code using background tasks.
Key points
Write your RTC app code using background tasks.
Your app will be always reachable in
connected standby.

31. Related sessions
[APP-409T] Fundamentals of Metro style apps: how and when your app will run
[HW-456T] Understanding Connected Standby
[HW-566T] Networking for connected standby
[PLAT-785T] Creating connected apps that work on today's networks
[APP-396T] Using tiles and notifications

32. Further reading and documentation
Introduction to Background Tasks
Contact info – (optional)

33. thank you Feedback and questions http://forums.dev.windows.com
Session feedback

34. 12/2/ :23 PM
© 2011 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.
© 2011 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

35. Backup

36. Lock Screen API sample void AddToLockScreen() {
    IAsyncOperation<LockScreenState> operation = LockScreen.AddToLockScreenAsync();
    operation.Completed = OnAddToLockScreenOperationCompleted;
    operation.Start(); }
void OnAddToLockScreenOperationCompleted(IAsyncOperation<LockScreenState> operation) {
    if (operation.Status == AsyncStatus.Completed)
    {
        LockScreenState result = operation.GetResults();
        switch (result)
        {
            case LockScreenState.NotOnLockScreen:
                break;
            case LockScreenState.OnLockScreen:
            case LockScreenState.DefaultNotOnLockScreen:
        }
    }
    else if (operation.Status == AsyncStatus.Error){
// Report error
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

37. Registering for Network Change
System Event
Registering for Network Change
using Windows.ApplicationModel.Background;
// Specify the trigger
IBackgroundTrigger trigger =
new SystemTrigger(SystemTriggerType.NetworkStateChange, false);
// Associate app code with the trigger
BackgroundTaskBuilder taskBuilder = new BackgroundTaskBuilder();
taskBuilder.TaskEntryPoint = “MyAppBackground.NetworkStateChangeTask";
taskBuilder.SetTrigger(trigger);
taskBuilder.Name = “OnNetworkStateChange";
// Register the task for background execution
IBackgroundTaskRegistration taskRegistration = taskBuilder.Register();
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

38. App execution upon network change
System Event
App execution upon network change
using Windows.ApplicationModel.Background;
public sealed class NetworkStateChangeTask : IBackgroundTask {
public void Run(IBackgroundTaskInstance taskInstance) {
// Re-register Notification Channel }
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.